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 ###Instrução: Qual é a mudança de meados de 2010 a meados de 2011, onde a densidade em 1 de julho de 2011 é 508?
 ###Tabelas: CREATE TABLE 2007_list (2007_list_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Company VARCHAR, Headquarters VARCHAR, Industry VARCHAR, Sales (billion $) INT, Profits (billion $) INT, Assets (billion $) INT, Market Value (billion $) INT) CREATE TABLE political_subdivision (political_subdivision_id AUTO_INCREMENT PRIMARY KEY, Barangay VARCHAR, Area (km²) INT, Population (2007) INT, Population (2010) INT, Pop. density (per km²) INT) CREATE TABLE list_of_the_most_populous_us_counties_sorted_according_to_the_mid-2011_official_estimate_by_the_uscb (list_of_the_most_populous_us_counties_sorted_according_to_the_mid-2011_official_estimate_by_the_uscb_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, County VARCHAR, State VARCHAR, Land area (km²) VARCHAR, Land area (mi²) VARCHAR, April 1, 2010 census VARCHAR, April 1, 2010 density (/km²) VARCHAR, April 1, 2010 density (/mi²) VARCHAR, July 1, 2010 official estimate VARCHAR, July 1, 2010 density (/km²) VARCHAR, July 1, 2010 density (/mi²) VARCHAR, July 1, 2011 official estimate VARCHAR, July 1, 2011 density (/km²) VARCHAR, July 1, 2011 density (/mi²) VARCHAR, Mid-2010 to mid-2011 change (Absolute) VARCHAR, Mid-2010 to mid-2011 change (%) VARCHAR, County seat or courthouse VARCHAR) CREATE TABLE european_cup_history (european_cup_history_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Competition VARCHAR, Round VARCHAR, Club VARCHAR, Home VARCHAR, Away VARCHAR, Aggregate VARCHAR) CREATE TABLE doubles_8–4 (doubles_8–4_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in final VARCHAR, Score in final VARCHAR)  
SELECT Mid-2010 to mid-2011 change (%) FROM list_of_the_most_populous_us_counties_sorted_according_to_the_mid-2011_official_estimate_by_the_uscb WHERE July 1, 2011 density (/mi²) = 508